Timeline for Equivalence between diode and transistor
Current License: CC BY-SA 4.0
7 events
| when toggle format | what | by | license | comment | |
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| May 5, 2023 at 21:42 | comment | added | John Doty | Degradation in Zener mode depends a great deal on the part. Old, fat, general-purpose transistors like 2N2222 don't degrade much at all. Narrow-base RF transistors are quite touchy. | |
| May 4, 2023 at 22:11 | comment | added | LorenzoDonati4Ukraine-OnStrike | @TimWilliams anyway what I was trying to say is that once the BE junction breaks down, you really don't know how the specs of the BJT changed (without measuring). So, if you are learning about this thing and make some tests, it's better that you don't put back your BJT back with the other "good" ones because it may be way out of spec for other projects. | |
| May 4, 2023 at 22:08 | comment | added | LorenzoDonati4Ukraine-OnStrike | @TimWilliams Sorry, I was interrupted in the middle of an edit (real life, you know). So I was adding a note about the degradation being a gradual process. However I didn't know the damage could be reversed. Thanks for the info. | |
| May 4, 2023 at 15:49 | comment | added | Tim Williams | Not ruined forever; the decline of forward hFE with reverse bias follows a charge transport mechanism IIRC, so it takes some time to reach a failure state (hFE below specified minimum). The damage can be partially annealed out at soldering temperatures. Also note that B-C junction generally has lower leakage but higher recovery than B-E. | |
| May 4, 2023 at 15:14 | history | edited | LorenzoDonati4Ukraine-OnStrike | CC BY-SA 4.0 |
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| May 4, 2023 at 15:06 | history | edited | LorenzoDonati4Ukraine-OnStrike | CC BY-SA 4.0 |
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| May 4, 2023 at 15:01 | history | answered | LorenzoDonati4Ukraine-OnStrike | CC BY-SA 4.0 |